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Authors
Xu, Chaofa https://orcid.org/0000-0003-0723-8540
Chen, Guangxu
Zhao, Yun
Liu, Pengxin
Duan, Xinping https://orcid.org/0000-0002-9191-1437
Gu, Lin https://orcid.org/0000-0002-7504-031X
Fu, Gang
Yuan, Youzhu https://orcid.org/0000-0003-1668-9984
Zheng, Nanfeng https://orcid.org/0000-0001-9879-4790
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Article History
Received: 10 December 2017
Accepted: 18 July 2018
First Online: 22 August 2018
Competing interests
: The authors declare no competing interests.
